Acoustic Guitar Construction in the small shop -- Kenneth Michael Guitars LLC

Information, ideas and help for those constructing scratch built acoustic guitars or acoustic guitar kits - © 2017
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The purpose of this forum site is to provide a means for acoustic guitar makers at all skill levels to forward information, share experience and ask questions if project obstacles are encountered. We ask that egos be left at the door – the highest levels of courtesy and respect are to be shown to all. Posts containing disparaging comments will be removed. The “Acoustic Guitar Construction Forum” is owned by Kenneth Michael Guitars and is copy protected. Direct links to luthier suppliers are not permitted and will be edited.



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 Post subject: Shoulder brace contour?
PostPosted: Thu Apr 27, 2017 10:05 am 
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Location: Manchester, UK
Hi everyone, I've been studying the KMG section on achieving neck angle by flattening the upper bout rim, by raising it in the mold by 8 cards thickness, and keeping the waist clamped level with the rim etc. Earlier in the section, there is mention of the shoulder brace being contoured at the ends and flat in the center to accomodate the flat bottom of the FB. Maybe I'm not quite reading this correctly, but does sanding the upper bout rim as above, negate the need to radius the ends of the shoulder brace so that it's all flat, or is it still necessary ? And if it's still necessary to radius the ends of the shoulder brace, by how much? On the diagrams, the radiussed area of this brace appears to be a couple of inches or so at each end, leaving a fairly long flat section which is flat. Obviously, the wider the flat section, the lower the effect of the brace to raise the top to the right level. And, the narrower the flat section, the higher the raised top will be.
So, is there a fixed length for this flat area, to fit in with the rest of figures quoted in the section, i.e. 40' radius top(x braces) and 89 deg neck angle?
Sorry if this is a bit long winded, but I'm just trying to understand. Thanks in advance.
Mike


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PostPosted: Thu Apr 27, 2017 2:23 pm 
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You'll never know the difference if you add the tiny slope to the ends of the shoulder brace or not. When we prepare the shoulder brace for out kits we barely touch the last two inches or so of each end, if I did not tell you, you would not even notice. I doubt that most manufactures/builders even bother with this step.

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PostPosted: Thu Apr 27, 2017 4:04 pm 
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Joined: Sun Mar 19, 2017 12:14 pm
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Location: Manchester, UK
Ken, thanks for the response, but to quote the KMG instructions "Even more importantly – before gluing the shoulder brace to the top you must know how
high it rises under the fingerboard area and what angle, that rise creates back to the neck
block at the rim." and this part confuses me. Do I slope the end 2 inches or keep it all flat?
thanks Mike.


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PostPosted: Thu Apr 27, 2017 4:19 pm 
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Are you sure it says that in the instructions? Or is it in one of the articles stating a general premise?

This is what's said in the instruction manual --

"The shoulder brace is almost flat on
the edge that is glued, there is a subtle
taper at both ends to blend with the
contour of the “X” bracing."

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PostPosted: Thu Apr 27, 2017 5:15 pm 
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Joined: Sun Mar 19, 2017 12:14 pm
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Location: Manchester, UK
Ken, it's in this section, maybe I was incorrect to say instructions. http://www.kennethmichaelguitars.com/neckangle.html
Nevertheless, the same question remains. Please bear in mind this is my first guitar build, so I've no experience to fall back on. and so I seek the advice of experts like yourself. I decided to follow the guidance from the said instructions from the success kit, section 2 rim assembly, and sanded the upper bout as suggested, and now need to know what to do next with regards to the shoulder brace. Sorry to labour the point. Thanks Mike.


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PostPosted: Thu Apr 27, 2017 5:16 pm 
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See above post

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KMG Guitar Kit Information
http://www.kennethmichaelguitars.com/kitinfopackage.html


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